SIS, SIF and SIL concepts
Цель: Изучить тему «SIS, SIF and SIL concepts» и закрепить её практическими заданиями и самопроверкой.
2 акад. часа чтение и разбор теории, решение задач, работа со схемой или виртуальным стендом и проверка понимания.
Основной материал
Safety Instrumented System contains Safety Instrumented Functions designed to reduce risk. A SIF includes sensors, logic solver and final elements. SIL is integrity level linked to risk reduction requirements and probability of dangerous failure, determined through formal lifecycle methods.
BPCS vs SIS
Basic Process Control System manages normal operation. SIS independently handles defined hazardous scenarios. Sharing components can compromise independence and must be evaluated according to standards.
Proof testing
Hidden dangerous failures may not appear during normal operation. Periodic proof tests aim detect them. Test coverage and interval influence PFDavg.
Практическая работа
Draw conceptual SIF: two pressure transmitters? logic solver -> ESD valve. Identify sensor, logic and final element. Do not assign SIL without analysis.
Самопроверка
• What is SIS?
• What is SIF?
• What are three SIF parts?
• What does SIL represent generally?
• Why proof test needed?
Что нужно запомнить
- Safety Instrumented System contains Safety Instrumented Functions designed to reduce risk.
- A SIF includes sensors, logic solver and final elements.
- SIL is integrity level linked to risk reduction requirements and probability of dangerous failure, determined through formal lifecycle methods.
- Sharing components can compromise independence and must be evaluated according to standards.
- Hidden dangerous failures may not appear during normal operation.